Police are appealing for witnesses to a car and house fire in Cheltenham early this morning.
Investigators were told an unoccupied parked car outside a residence on Moonda Crescent caught fire then spread to a residential unit about 2.35am.
Occupants of the unit, a 50-year-old woman and a 12-year-old boy were unharmed in the incident.
The fire is being treated as suspicious and an investigation into the circumstances is ongoing.
Anyone who witnessed the incident or with dash cam footage or information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppervic.com.au.